\begin{tikzpicture}
  \matrix [matrix of nodes,nodes in empty cells,nodes={anchor=west,inner sep=0em,minimum size=1.2em}] (m)
      {
          &&&& \node (n8) [circle, draw] {8};&&&& \\
          \\
          &&\node (n6) [circle, draw] {6};&&&&&& \\
          &&&&&&&&\node (n7) [circle, draw] {7}; \\
          &&&& \node (n5) [circle, draw] {5};&&&& \\
          \node (n2) [circle, draw] {2};&&&&&&&& \\
          \\
          \node (n1) [circle, draw] {1};&&&&&\node (n3) [circle, draw] {3};&&&\node (n4) [circle, draw] {4}; \\
      };
      \node[left=0em of n8]{/};
      \node[right=0em of n8]{B|$t_{8}$};
      \node[left=0em of n6]{*};
      \node[right=0em of n6]{A|$t_{3}$,$t_{6}$};
      \node[left=0em of n7]{--};
      \node[right=0em of n7]{$t_{7}$};
      \node[left=0em of n5]{+};
      \node[right=0em of n5]{$t_{2}$|$t_{5}$};
      \node[right=0em of n2]{6.28|$t_{1}$,$t_{4}$};
      \node[right=0em of n1]{5|\bcancel{B}};
      \node[right=0em of n3]{R};
      \node[right=0em of n4]{r};
      
      \draw[-](n8)--(n6);
      \draw[-](n8)--(n7);
      \draw[-](n6)--(n2);
      \draw[-](n6)--(n5);
      \draw[-](n5)--(n3);
      \draw[-](n5)--(n4);
      \draw[-](n7)--(n3);
      \draw[-](n7)--(n4);
\end{tikzpicture}